x-pretul bicicletei
y-pretul tabletei
z-pretul adidasilor
x+y+z=500
x,y,z ip cu 10, 6 si 5
10x=6y=5z=k
x=k/10
y=k/6
z=k/5
k/10 +k/6 +k/5 =500 aducem la acelasi numitor
3k+5k+6k=15 000
14k =15 000
k=15 000/14= 7500/7
x= 1/10 * 7500/7= 750/7
y= 6 * 7500/7= 1250/6
z=5 * 7500/7= 1500/7